Hot-air-furnace bonnet.



W. P. DAW.

HOT AIR FURNACE BONNET.

APPLICATION FILED MAY 20, 1913.

1,094,309, Patented Apr. 21, 1914.

2 SHEETS-SHEET 1.

ELI.

WITNESSES INVENTOI? ATTORNEYS COLUMBIA FLANOGRAPH (IO-.WASHINGTDN, D c.

W. P. DAW.

HOT AIR FURNACE BONNET.

APPLIGATION FILED MAY 20, 1913.

1,094,309, Patented Apr. 21, 1914.

2 SHEETS-SHEET 2.

WITNESSES I i7 IIVVENTOR KmfQMM Wlzmm FfiaW ATTORNEYS coLummA PLANOGRAPH C0.,WASH1NGTON. D. c.

UNITED STATES PATENT OFFICE.

WILLIAM PATRICK DAV], OF HARTFORD, CONNECTICUT, ASSIGNOR OF ONE-HALF TO THE WILBUR S. STEELE 00., OF HARTFORD, CONNECTICUT.

HOT-AIR-FURNACE BONNET.

To all whom it may concern Be it known that I, WILLIAM P. DAW, a citizen of the United States, and av resident of Hartford, in the county of Hartford and State of Connecticut, have invented a new and Improved Hot-Air-Furnace Bonnet, of which the following is a full, clear, and eX- act description.

This invention relates to improvements in hot air furnaces and pertains more particularly to a bonnet therefor.

The invention has for its general object to improve and simplify the construction of devices of the character referred to so as to be comparatively simple and inexpensive to manufacture, of durable and substantial design and possessing the advantage of increasing the efficiency of the furnace as regards its air distributing quality.

Another object of the invention is the pro-' vision of a bonnet which is made of parts so designed that the bonnet can be shipped from manufacturers or jobbers in collapsed form to the point of installation, as the parts can be readily locked or fastened together without special machinery or particular skill to form the complete bonnet for application to the body of the furnace.

Another object of the invention is the provision of a hot air furnace bonnet having its body portion made up of a plurality of sections and a top or crown plate interlocked therewith and provided with openings so arranged that the hot air pipes or ducts will be disposed in the best position for effecting an eflicient distribution of hot air, the openings being grouped close to the center of the crown plate where the air is the Warmest and the flow the greatest. At the same time the bonnet is of great durability and is economical to construct, as a single workman can produce the bonnet in about one-third the time required for other types of furnace bonnets.

With these objects in view, and others as will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be more fully described hereinafter and set forth with particularity in the claims appended hereto.

In the accompanying drawings which illustrate one embodiment of the invention, and wherein similar reference characters are employed to designate corresponding parts Specification of Letters Patent.

Application filed May 20, 1913.

Patented Apr. 21, 1914.

Serial No. 768,757.

throughout the several views, Figure 1 is a perspective view of the complete bonnet; Fig. 2 is a vertical section thereof showing the bonnet in position on a furnace body; Fig. 3 is a plan view of one of the blanks from which a section of the body portion of the bonnet is formed; Fig. 4: is a plan view of the blank forming the crown plate; Fig. 5 is a detail section on the line 55 of Fig. 1; Fig. 6 is a perspective view of one of the sections of the body portion of the bonnet with an intermediate part broken away; and Fig. 7 is a sectional view through the joint between two adjacent sections of the body of the bonnet.

Referring to the drawing, A designates the bonnet and B the furnace body, the hon net being circular at its bottom to fit over the furnace body B, and the body 1 of the bonnet tapers upwardly or is reduced in diameter, and at its top the body 1 is polygonal instead of circular in form for connection with a polygonal crown plate 2. The body of the bonnet is made up of quarter sections a which are formed from a blank shown in Fig. 3. This blank comprises a body portion 3 and a rim portion 4 connected with the body portion by a flangeforming portion 5 which is doubled back on itself on the line 6 and bent on the lines 7 and 8 to a position at right-angles to the rim portion 4. The upper edge of the rim 4 is bent back on itself along the line 9 to form a flange 10, clearly shown in Figs. 2 and 6, for strengthening the rim and also interlocking with the crown plate 2. Each extremity of the rim portion 4 of the blank, Fig. 3, is formed into a pair of lugs 11 and 12, whereby adjacent sections a can be interlocked, and the body 3 of the blank has one edge bent on the line 13 into a flange 14 that is provided with spaced locking lugs 15, while the opposite edge of the body portion 3 is bent on a line 16 into a flange 17 that is in turn bent on a central longitudinal line 18 into V-shaped cross-section, there being slots or openings 19 in the line 18, such doubled flange 17 serving to receive the flange 14; of an adjacent section a, while the lugs 15 enter the openings 19 and are locked by being bent backwardly against the doubled flange, as shown in Figs. 2 and 7.

The crown plate 2 is square in the present instance, as shown in Fig. 4:, and each edge is bent upwardly on a line 20 to form rim-engaging flanges 21. The crown plate a is set into the upper end of the body formed by the sections a, and rests on the internal flange 5, and the flanges 10 on the rim 4' are bent downwardly over the flanges 21 of the crown plate, thus firmly holding the crown plate in position and making the joints between the crown plate and body of the bonnet perfectly air-tight. The crown plate is provided with a plurality of openings 22 at each of which is fastened a collar 23 for receiving an air duct. then the sections a of the body of the bonnet are fastened together the lug 11 at one end of the rim portion t of each section is lapped under the rim portion of an adjacent section, while the lug 12 at the opposite end is lapped under the section adjacent such end, and thereafter the lugs 12 and 11, which are normally disposed in the plane of the rim portion 4, are bent so as to lap over the outside of the rim portions l of adjacent blanks, as clearly shown in Fig. l. A furnace bonnet constructed in this manner is extremely durable, capable of being easily put together and so designed that the hot air will pass into the box in the most effective manner, that is to say, the hot air ducts are at the top of the furnace where the air is the hottest and the draft strongest.

From the foregoing description taken in connection with the accompanying drawings, the advantages of the method of operation and of the device shown will be readily understood by those skilled in the art to which the invention appertains, and while I have described the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired as are within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A hot air furnace bonnet comprising a body made in a plurality of connected sections, each section having a curved bottom edge and a straight top edge and having an upwardly extending straight rim, and a crown plate set into the body and having an interlocking engagement with the rim portions of the said sections.

2. A hot air furnace bonnet comprising a body provided with an internal flange, with a rim disposed above the flange, a crown plate disposed within the rim and resting on the flange, flanges on the crown plate, and flanges on the rim engaging the flanges on the crown plate.

3. A hot air furnace bonnet comprising a body provided with an internal flange and a rim extending upwardly from the flange and integrally connected by the flange with the said body, a crown plate disposed within the rim and resting on the flange, a flange on the crown plate, and means securing the said rim and flange of the crown plate together.

t. A furnace bonnet comprising a body made up of sections, each section having at one end a doubled flange and at the opposite end a; single flange interlocked with the doubled flange, said doubled flange having apertures, lugs on the single flange for engaging in the apertures and bendable backward on the outside of the doubled flange, each section having a longitudinal flange and a rim portion above the flange, and a crown plate resting on the longitudinal flange and interlocked with the rim portion. 5. A furnace bonnet comprising a body of circular form at its base and polygonal form at its top, said body being made in sections,

. a crown plate of polygonal form to fit with in the top of the body and having upstanding flanges, and means securing the crown plate and body together.

6. A furnace bonnet comprising a body, circular at its base, and having a polygonal upstanding rim at its top, said body being formed in sections with their adjacent edges having flanges bent to engage and interlock with each other, and a crown plate fitted within said rim.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

\VILLIAM PATRICK DAWV.

WVitnesses EDWALD L. STEELE, FRANCIS H. PARKER.

Copiea of this patent may be obtained for five cents each, by addressing the Commissioner of Patentl, Washington, D. C. 

